Differentiated TTI Lengths for TDD Resource Efficiency
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Solution Overview
Problem
In future radio communication systems, there is a demand for increased usage efficiency of radio resources and reduced delay, particularly in switching between downlink and uplink in Time Division Duplex (TDD) mode, where the current dynamic switching per transmission time interval (TTI) does not sufficiently reduce delay due to inefficiencies in resource allocation.
Innovation Solution
A user terminal and radio base station configuration where the downlink (DL) and uplink (UL) TTI lengths are differentiated, with the UL TTI being shorter than the DL TTI, allowing for dynamic adjustment of TTI lengths based on traffic demands, thereby optimizing resource usage and reducing overhead and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic switching between DL and UL per TTI is implemented in TDD mode, then resource allocation flexibility is improved, but delay reduction is insufficient
Solution Approach 1:
The patent segments the TTI into two distinct types: DL TTI for downlink transmission and UL TTI for uplink transmission. This segmentation allows independent optimization of each direction's timing characteristics, enabling the system to achieve both resource allocation flexibility and reduced delay by assigning appropriate TTI lengths to each direction based on traffic requirements.
Solution Approach 2:
The patent implements dynamic switching between DL and UL by allowing the TTI length to vary depending on the transmission direction and traffic conditions. The system can dynamically adjust whether to use DL TTI or UL TTI for each transmission opportunity, providing adaptability while optimizing delay performance through direction-specific timing configurations.
2Device complexity
If uniform TTI length is used for both DL and UL, then system complexity is reduced, but radio resource usage efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different TTI length characteristics to different transmission directions (DL and UL) based on their specific traffic patterns and requirements. This allows each direction to have optimized timing parameters locally, improving overall radio resource usage efficiency without requiring complex system-wide reconfiguration.
Solution Approach 2:
The patent creates a universal TDD framework that can handle both DL and UL transmissions with a unified switching mechanism. The dual TTI structure serves multiple functions: it provides flexibility for different traffic types, enables efficient resource allocation for both directions, and maintains system-wide coordination through standardized switching rules.
Data Source
AI summary
A terminal is disclosed that includes a receiver that receives downlink control information used for scheduling a physical shared channel and a processor that determines a symbol section that is allocated to the physical shared channel by using information, included in the downlink control information, regarding a resource to be allocated. In other aspects, a radio communication method for a terminal is disclosed.